Nut.



H. G. CARLSON.

NUT.

APPLICATION FILED FEB. l. 1913. RENEwED AP11.22.|915.

1,15%615. Patented 001. 19, 1915.

Mmmm mfmm.

@Mm Pennac ernten..

HJA'LMAR G. CARLSON, OF WORCESTER, MASSACHUSETTS, ASSIGNOR T0 ROCKWOOI SPRINKLER COMPANY OF MASSACHUSETTS, OF WORCESTER, MASSACHUSETTS, A.

CORPORATION OF MASSACHUSETTS.

N UT.

Specification of Letters Patent.

Patented Oct. t9, i915.

Application 1ed` Febrnary1'1'913, Serial Nb. 745,527. Renewed April 22, 1915. Serial No. 23,214.

enable a series or 'nest of nuts to be punched out of a piece of sheet metal, each nut, ex'- cept the largest thereof, being not only formed of the material taken out of the interior of a larger nut, but having its periphery coincident with the interior surface of the next larger nut so as to avoid substantially all waste between these two surfaces, and yet provide a nut which will be capable of being properly screw threaded on the interior, and of being held between the" jaws of an ordinary wrench.

Further objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which- Figure l is a plan of a sheet of metal with a series or nest of nuts out from it in accordance with this invention; and Fig. 2 is a perspective view 4of one of said nuts.

In order that practical and durable nuts may be produced each consisting of a singleA pie-ce of hard metal, such as sheet malleable iron, steel, brass or the like, to give them such a form as to permit them to be cut out of sheet stoel( without waste, and yet have the other' necessary characteristics, the nuts, as indicated in Fig. 2, are made of a general cylindrical form, and on the outer surface thereof they are provided with longitudinal ribs a, that is, ribs parallel with the axes of the nuts. These ribs in the present instance are shown as convex and substantially semicylindrical in form, but other shapes can be employed. They are, however, spaced apart around the periphery of the nut sufficiently to permit the aws of the usual wrenches to be inserted at the spaces so as togrip the nuts with the same force and effect as is the case with polygonal nuts. The nuts are also provided with internal recesses preferably of the same shape, size and location as said ribs, whereby the ribs of a small nut are formed from the metal removed from the next larger sized nut in the formation of the recesses; also with this arrai'igement it will be seen that the nuts having the recesses are not materially weakened at these points as the recesses although extending in beyond the normal surface of the nut are strengthened on the outer surface by the ribs.

From what has'be'en said, it will be seen that the external surface of the nut is capable' ofl performing all the functions of the usual polygonal surfaced nut.

As to the interior of the nut it will be seen that it can be tapped out so as to provide a discontinuous screw thread, this thread being interrupted at each of the recesses. This facilitates the cutting of the thread in the first place as a material porticn of the metal usually cut by the tap is missing, but especially for the reason that the chips produced by the screw cutting tap can be discharged through the recesses as the process of cutting goes on. Moreover when the nut is in use the dirt and particu larly metal chips and the like tend to be discharged through these recesses or rather to be forced out into them where they re* main out of contact with the screw. Both the ribs and recesses extend through the nut from side to side in a direction parallel with the axis thereof. A very important advantage of this invention, however, lies in the fact that a series of these nuts can be punched out of sheet metal so as to utilize all of the metal except that which is inside the smallest and outside the largest one. In this way a very high degree of economy is attained in the manufacture of these articles, nearly all the waste being eliminated, and moreover the punching operations are virtually reduced nearly fifty percent, because the operation of each punch or cutter per- I am aware of the fact that modifications can be made therein ioy any person skilled in the art without departing from the scope ofthe invention as expressed'in the claims. Therefore, I do not wish to he limited in this respect, butV `What I do claim is l. As an article of manufacture, a nut consisting of a single substantially iat piece of hard metal of a general cylindrical form both internally and externally, having a series of external ribs provided with spaces between them for the reception of the jaws of a wrench, and a corresponding series of internal recesses, forming interruptions of the internal thread.

2. As an article of manufacture, a nut consisting of a single substantially fiat piece of metal ofa general cylindrical form, having as Ties ofexternal ribs provided with spaces between them for the reception of the jaws of a wrench, and a corresponding series of internal recesses of substantially the same shape and relative location as said ribs.

3. As an article of manufacture, a circular sheet metal nut having external ribs and Y internal recesses, both ribs and recesses cxtending from one side of the nut to the other, and the recesses extending across the entire interior threaded surface.

4. As an article of manufacture, a circular sheet metal nut having external convex ribs and internal concave recesses, both ribs and recesses extending from one side of the nut to the other and registering with each other.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses.

HJALMAR G. CARLSON.

Witnesses: v

ALBERT E. FAY C. FoRRnsT WEssoN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, 1).'0. 

